But isn't it how the media works, I mean Terminator 2 had T 1000, Aliens had Queen, ecery new adventure of the franchise needs to create new unthinkable chalange for the characters and viewer(it's in every media, cartoon tv shows, anime, manga, comics, ). Now is the Big Upgraded Predator the best decision, nope for me, but it folllows the rules of all franchises.
Except you didn't deal with a bigger and tougher Terminator in Terminator 2. The T-1000 and T-800 were still equally matched for the most part. It was just because of the T-1000's unique body, that you could never really put it down for the count for too long, as it would heal from every injury. And of course, over time, it would gain the upper hand against the T-800.
And the Alien Queen in Aliens was just a natural progression of the species. The Facehuggers hatched from eggs. So the question was, who laid the eggs? And the Queen wasn't even the focus of the Movie, as Ripley and the Marines dealt with regular Aliens, for most of the Movie. The Queen only came into play towards the end of the Movie and it didn't make the regular Aliens obsolete.
In The Predator, the regular Predator is apparently getting b**ch slapped around, before getting its head torn off, in a very one sided battle.